Press Releases

  • Apr 17th, 2018

    TCarta Delivers Satellite-Derived Land/Sea Floor Surface Models for Caribbean Disaster Recovery

    BRISTOL, United Kingdom, 17 April 2018 – TCarta, a global provider of marine geospatial products, has delivered pre- and post-disaster surface models for the Caribbean islands of Antigua and Barbuda for use in Hurricane Irma rebuilding efforts. The satellite-derived surface models contain seamless datasets of onshore elevation and offshore water depth measurements for each island.

    The Centre for Environment, Fisheries and Aquaculture Science (Cefas) commissioned the data collection as part of the Commonwealth Marine Economies Programme. TCarta won a competitive tender, which requested end products derived from satellite imagery.

    “By specifying satellite-derived data as the deliverable in its tender, Cefas acknowledged the speed this technology offers compared with traditional ship-borne surveying or airborne LiDAR collection in reacting to natural disasters,” said TCarta CEO David Critchley.

    Hurricane Irma devastated islands across the Caribbean in September 2017. The government of Antigua and Barbuda identified a need for data for onshore land elevations and offshore water depths from before and after the storm hit. The datasets will be used in digital change detection analyses to determine how Irma altered the surfaces of the land and seafloor, which will inform the development of a national adaptation strategy and further data collection. “A seamless onshore-offshore dataset is crucial to understand the dynamic terrestrial and near-shore environments, or to be used in coastal flooding and impact modelling.” said Critchley.

    Delivers Satellite-Derived Land

    Seamless land and shallow water terrain model of the island of Antigua derived from high-resolution satellite imagery.

    For the seafloor dataset, the TCarta team generated Satellite Derived Bathymetry products by extracting water depth measurements from high-resolution multispectral imagery acquired by the DigitalGlobe WorldView satellites. In the waters around Antigua and Barbuda, bathymetric points were delivered on a 2-meter spacing to deeper than 20 meters in the clearest waters.

    The TCarta team created digital surface models of the terrain on Antigua and Barbuda, utilizing a technique to derive surface elevations at 0.5-meter point spacing from multiple WorldView images captured over the islands. Buildings and vegetation were then removed from surface models to yield bare-Earth elevation models.

    TCarta delivered the before-and-after datasets to Cefas who in turn will share them with scientists and Government officials in Antigua and Barbuda to study the less visible changes underwater and to inform climate change adaptation plans.

    About TCarta

    TCarta was established when TCarta Marine U.S. merged with Proteus Geo UK to create global bathymetric and marine datasets extending from the shallow coastal zone to the continental shelf. The international firm maintains offices in Denver, Colorado, and Bristol, UK. The TCarta product lines includes high-resolution satellite-derived water depth and seafloor map products as well as 90- and 30-metre GIS-ready bathymetric data aggregated from numerous information sources.

    About CME Programme

    The Commonwealth Marine Economies (CME) Programme was announced by the British Prime Minister in 2015 to enable sustainable economic growth and alleviate poverty in Commonwealth Small Island Developing States (SIDS).

    The CME Programme aims to ensure marine resources that belong to Commonwealth SIDS are better understood and managed, with the aim of enabling sustainable and growing marine economies in Commonwealth SIDS that create jobs, drive national economic growth, reduce poverty, ensure food security and build resilience.

    The Programme is being delivered by a partnership of UK government marine expertise:  United Kingdom Hydrographic Office (UKHO), the Centre for Environment, Fisheries and Aquaculture Science (Cefas) and the National Oceanography Centre (NOC).

    About Cefas

    Cefas supports governments, business and society in the UK and internationally to ensure that seas and rivers are healthy and productive, thereby enabling food security and sustainable development.  Cefas is the UK’s most diverse centre for applied marine and freshwater science and an Executive Agency of the UK Government’s Department for Environment, Fisheries and Rural Affairs (Defra).